SQL Server - after insert trigger - update another column in the same table

Question

I\'ve got this database trigger:

CREATE TRIGGER setDescToUpper
ON part_numbers
 AFTER INSERT,UPDATE
AS
DECLARE @PnumPkid int, @PDesc nvarchar(128)

SET @Pnum         


        

Answer 1

create or replace 
TRIGGER triggername BEFORE INSERT  ON 
table FOR EACH ROW 
BEGIN
/*
Write any select condition if you want to get the data from other tables
*/
:NEW.COLUMNA:= UPPER(COLUMNA); 
--:NEW.COUMNa:= NULL;
END; 

The above trigger will update the column value before inserting. For example if we give the value of COLUMNA as null it will update the column as null for each insert statement.